Magic

Magic is a force in the Related Worlds used to override the laws of nature. Chrestomanci's job is to police the use of magic throughout the Related Worlds. A use of magic is called a spell, which requires either ingredients or an incantation. Magic is dangerous, but has no effect on measles, as stated in Stealer of Souls. However, magic can be removed by Chrestomanci, since it is an inborn trait. A person who practices magic is known as a magic-user, and another way of referring to them is the slur "hag".